Resonance transducer

ABSTRACT

There is provided a resonance transducer including a main bridge linked with an input signal. The resonance transducer includes a transformer assembly across which an output signal can be tapped, a resonance circuit and a control circuit. In this arrangement, the transformer assembly is linked with the main bridge and the resonance circuit, the resonance circuit is further linked with the main bridge and the control circuit, and the control circuit is further linked with the main bridge.

FIELD OF THE INVENTION

The invention relates to a resonance transducer, in particular a triggering of the resonance transducer as well as to a power supply including a resonance transducer according to the invention.

BACKGROUND OF THE INVENTION

The resonance transducers known from prior art have the disadvantage that the output voltage of the secondary circuit is proportional to the input voltage of the resonance transducer and is predefined to a large extent by the turns ratio of the two coils in the resonance transducer. Further, controlling the circuits described e.g. in [2] is inefficient, because the resonance current flows through all the switching elements which accordingly have to be designed in order to perform in a powerful manner.

SUMMARY OF THE INVENTION

The object of the invention is to provide a resonance transducer which allows a controlling of the output voltage, while such controlling of the output voltage is efficient and possible without the elaborative use of expensive components. It is further an object of the invention to provide for a possibility of an efficient triggering of the resonance transducer and, finally, a switched mode power supply including a resonance transducer according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will be illustrated and explained in the following on the basis of the drawings in which:

DESCRIPTION OF EXAMPLE EMBODIMENTS

In FIG. 1 there is shown a block diagram of a resonance transducer. Here, an input signal Vin is linked with a main bridge 110 through inputs 104 and 105. The inputs 104 and 105 can be configured as input terminals, connectors or pins, for example. Input 105 preferably may be at ground potential, so that in particular input 104 receives the input signal +/− Vin (with regard to ground potential). 

1. A resonance transducer comprising a main bridge (110) linked with an input signal (Vin), comprising a transformer assembly (120) across which an output signal (Vout) can be tapped, comprising a resonance circuit (130), comprising a control circuit (140), the transformer assembly (120) being linked with the main bridge (110) and the resonance circuit (130), the resonance circuit (130) further being linked with the main bridge (110) and the control circuit (140), the control circuit (140) further being linked with the main bridge (110).
 2. The resonance transducer according to claim 1, wherein the main bridge (110) comprises a first switch (V1) and a second switch (V2) which are provided in series connection.
 3. The resonance transducer according to claim 2, wherein the ends of the series-connected first and second switches (V1, V2) are linked with the input signal (Vin) and the resonance circuit (130).
 4. The resonance transducer according to, claim 2, wherein a middle (Drain1) between the series-connected first and second switches (V1, V2) is linked with the transducer (120).
 5. The resonance transducer according to claim 2, wherein at least one of the first and second switches (V1, V2) is an electronic switch.
 6. The resonance transducer according to claim 1, wherein the control circuit (140) comprises a control bridge.
 7. The resonance transducer according to claim 6, wherein the control bridge comprises a third switch (V3) and a fourth switch (V4) which are provided in series connection.
 8. The resonance transducer according to claim 7, wherein the ends of the series-connected third and fourth switches (V3, V4) are linked with the main bridge (110) and the resonance circuit (130).
 9. The resonance transducer according to claim 7, wherein a middle (Drain3) between the series-connected third and fourth switches (V3, V4) is linked with the resonance circuit (130) through a control choke (L2).
 10. The resonance transducer according to claim 7, wherein at least one of the third and fourth switches (V3, V4) is an electronic switch.
 11. The resonance transducer according to claim 5, wherein the electronic switch is a transistor or a MOSFET or a thyristor or an IGBT.
 12. The resonance transducer according to claim 5, wherein a free-wheeling diode is arranged parallel to the switch in each case.
 13. The resonance transducer according to claim 1, wherein the transformer assembly (120) comprises at least one coil (202, 203, 204).
 14. The resonance transducer according to claim 1, wherein the transformer assembly (120) comprises at least one transformer (202, 203, 204).
 15. The resonance transducer according to claim 1, wherein the transformer assembly (120) comprises a primary circuit (202) and a secondary circuit (203, 204).
 16. The resonance transducer according to claim 15, wherein the primary circuit (202) is arranged between the main bridge (110) and the resonance circuit (130).
 17. The resonance transducer according to claim 15, wherein the output signal (Vout) can be tapped across the secondary circuit (203, 204).
 18. The resonance transducer according to claim 1, wherein the resonance circuit (130) comprises at least one inductor (L1) and/or at least one capacitor (C1, C2).
 19. The resonance transducer according to claim 1, wherein the resonance circuit (130) comprises two series-connected capacitors (C1, C2).
 20. The resonance transducer according to claim 19, wherein the ends of the series-connected capacitors (C1, C2) are each linked with the main bridge (110) and the control circuit (140).
 21. The resonance transducer according to claim 19, wherein a middle (Vres) between the series-connected capacitors (C1, C2) is linked with the transformer assembly (120) through a resonance choke (L1).
 22. The resonance transducer according to claim 21, wherein the middle (Vres) between the series-connected capacitors (C1, C2) is linked with the control circuit (140).
 23. The resonance transducer according to claim 1, wherein the input signal (Vin) is linked with the main bridge (110), the resonance circuit (130) and the control circuit (140).
 24. The resonance transducer according to claim 1, wherein the input signal is smoothed by means of at least one input capacitor (201).
 25. The resonance transducer according to claim 1, wherein the input signal (Vin) is an input voltage.
 26. The resonance transducer according to claim 1, wherein the output signal (Vout) is an output voltage.
 27. The resonance transducer according to claim 1, wherein the output signal (Vout) downstream of the transformer assembly (120) is rectified by means of at least one diode (101, 102) and preferably is smoothed with at least one output capacitor (103).
 28. A method of controlling or triggering a resonance transducer according to claim 1, wherein triggering the control circuit (140) will not occur in a first definable range.
 29. A method of controlling or triggering a resonance transducer according to claim 2, wherein a voltage curve (Drain1) between the first switch (V1) and the second switch (V2) is evaluated, wherein the third switch (V3) is switched off preferably simultaneously with a rising voltage edge of the voltage curve (Drain1).
 30. The method according to claim 29, wherein the third switch (V3) is switched on preferably prior to a rising voltage edge of the voltage curve (Drain1).
 31. The method according to any of the claim 29, wherein the fourth switch (V4) is switched off preferably simultaneously with a descending voltage edge of the voltage curve (Drain1).
 32. The method according to any of the claim 29, wherein the fourth switch (V4) is switched on preferably prior to a descending voltage edge of the voltage curve (Drain1).
 33. The method according to any of the claim 29, for performing a forward automatic gain control of the voltage ratio between the output signal (Vout and the input signal (Vin).
 34. A method of controlling or triggering a resonance transducer according to claim 2, wherein a voltage curve (Drain1) between the first switch (V1) and the second switch (V2) is evaluated, wherein the third switch (V3) is switched off preferably simultaneously with a descending voltage edge of the voltage curve (Drain 1).
 35. The method according to claim 34, wherein the third switch (V3) is switched on preferably prior to a descending voltage edge of the voltage curve (Drain1).
 36. The method according to claim 34, wherein the fourth switch (V4) is switched off preferably simultaneously with a rising voltage edge of the voltage curve (Drain1).
 37. The method according to claim 34, wherein the fourth switch (V4) is switched on preferably prior to a rising voltage edge of the voltage curve (Drain1).
 38. The method according to claim 34, for performing a reverse automatic gain control of the voltage ratio between the output signal (Vout) and the input signal (Vin).
 39. A switched mode power supply comprising a resonance transducer according to claim
 1. 40. A switched mode power supply comprising a resonance transducer according to claim 39, which resonance transducer is operated by means of a method according to claim
 28. 41. A method of controlling or triggering a resonance transducer according to claim
 7. 42. A method of controlling or triggering a resonance transducer according to claim
 7. 